Wave-detector for wireless telegraphy.



Z M 5 5M W. SOHLOBMILGH & P. F. PIGHON.

WAVE DETECTOR FOR WIRELESS TELEGRAPHY.

APPLICATION FILED APB.27, 1910.

Patented pt. 12,1911.

7 %%iWNMMWMWWWEZWg g j M EMM 93M MILOH, a subject of the King of Prussia, re-

tact bodies of a UNITED STATES PATENT OFFICE.

WILHELM SCHLOEMILCH, OF BERLIN, AND PAUL FERNAND PICHON, 0F STEGLITZ, NEAR BERLIN, GERMANY, ASSIGNORS TO QESELLSCHAFT FT IR DRAHTLOSE TELE- GRAPHIE M. B. 1-1., OF BERLIN, GER-MANY, A CORPORATION OF GERMANY.

WAVE-DETECTOR FOR WIRELESS TELEGRAPHY.

Original application filed April 14, 1906, Serial No. 311,678.

Specification of Letters Patent.

Patented Sept. 12, 1911.

1910. Serial No. 557,872.

To all whom it may concern:

Be it known that we, VVILHELM SoHLonsiding at Berlin, Germany, and PAUL Fnn- NAND Prorron, a citizen of the Republic of France, residing at Steglitz, near Berlin, Germany, have invented certain new and useful Improvements in lVave-Detectors for Wireless Telegraphy, of which the following is a full, clear, illustrated by the accompanying drawings.

Our present invention is a divisional application of our application Serial Nr. 311,678, filed April 14, 1906, which relates to wave detectors in which the contact of two substances under suitable pressure is influenced by electric waves and in which the action of the substances is of a thermoelectric or rectifying character, and which action does not depend upon an auxiliary electromotive force or potential. substances mentioned in this application as suitable for the purpose described in combination with'a non-oxidizable or diflicultly oxidizable substance, are iron-pyrites, which forms the subject matter of our present application. This material may be employed for either both contacts or only one. It is, however, preferable to form one of the congood conducting material, preferably of a material which does not oxidize or only oxidizes witlfdifliculty, for instance, platinum, gold, silver, aluminium, operates to the best advantage and without an auxiliary electromotive force in the circuit in which the detector is located.

In the accompanying drawings we have illustrated diagrammatically, as an example, a manner in which the two contact substances may be arranged. In this diagram, 1 indicates a piece of iron-pyrite, which is preferably embedded in tin 2 which is surrounded with a brass sheath or socket 3. Against the upper surface of the iron-pyrite bears a platinum pin 5 soldered toa screw 4 with suitable pressure. The screw is arranged in a vulcanite plug 6 which in turn is displaceably held by means of screw thread in the brass sheath or socket 3. On the upand exact description,

Among the per end of the vulcanite plug 6 a metal plate 7 is attached by means of screws and a short conductor 8 establishes an electric connection between the screw 4 and the metal plate 7. The connection of this detector and the contact members 1 and 5 respectively of the same with the circuits for wireless telegraphy takes place by means of the brass socket or sheath 3, on the one hand and the metal plate 7 on the other.

The form and size of the contact surfaces of both bodies according to the choice of the same has also been found to be of importance for obtaining favorable action.

It is preferable for instance, to cause the pressure contact with a point tov act on a polished or crystallinic surface of the ironpyrite; In this case only a comparatively small pressure between the contact elements may be used. If, however, the contact'elements are touching each other with a larger surface a suitably higher pressure is necessary.

What we claim is:

'1. A wave detector for wireless telegraphy, consisting of two contact bodies touching each other with a predetermined pressure, one of which consists of iron-pyrites.

2. A wave detector for wireless telegraphy consisting of two contact bodies one of which is formed of iron-pyrites and the other of a material which oxidizes with difliculty.

3. A wave detector for wireless telegraphy consisting of two contact bodies one of which is formed of iron-pyrites and the other of platinum, said contacts touching each other with a predetermined pressure, and operating without the aid of an auxiliary electromotive force.

In witnesswhereof we hereunto subscribe our names this 7th day of March A. I). 1910.

WILHELM SCHLOEMILCH. PAUL FERNAND rIoHoN.

Witnesses Hnr RY Hasrnn, WOLDEMAR HA UPT.

Divided and this application filed April 27, 

